10 to the power 3 means 10*10*10, or 1000
10 to the power MINUS 3 means 1 over 10 to the power 3, so 1/1000.
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10-3 is equivalent to 0.001.
4-3 = 1/64
3-2 x 3-3 = 3-5 or 1/243
3 to the power of 1 is 3. 3 to the power of minus 2 is equal to 1 over 3 to the power of 2. 3 to the power of 2 is 9. 3 to the power of 1 times 3 to the power of minus 2 is the same as... 3 divided by 3 to the power of 2. So that gives us 3 divided by 9 which is the same as 1/3.
n - 10 + 9n - 3 = 10n - 13